Android传感器直立旋转

Question

我知道有关于此的主题，而且我已经阅读了好几天。

我认为我的问题更具体。 我正在尝试使设备绕y轴旋转。

如果我是正确的，那就叫做方位角

当我运行应用程序时，在调试记录值[0]，值[1]和值[2]后，它在logcat中返回0.0

码：

mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

        SensorEventListener SEL = new SensorEventListener() {
            @Override
            public void onSensorChanged(SensorEvent event) {

                mSensorManager.getRotationMatrix(rotationMatrix, I, gravity, geomagnetic);

                mSensorManager.getOrientation(rotationMatrix, values);

                accy = values[0];

                System.out.println(accy);
            }

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {

            }
        };

        int rate = SensorManager.SENSOR_DELAY_GAME;
        mSensorManager.registerListener(SEL, accelerometer, rate);
        mSensorManager.registerListener(SEL, magnetometer, rate);

logcat的：

09-05 17:34:02.622    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.642    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.642    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.662    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.662    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.682    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.682    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.702    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.702    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.722    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.722    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.742    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.742    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.762    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.762    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.782    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.782    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.802    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0
09-05 17:34:02.802    6421-6421/com.ahewdev.eataround I/System.out﹕ 0.0

Answer 1

从上面的参数的代码gravity和geomagnetic在mSensorManager.getRotationMatrix(rotationMatrix, I, gravity, geomagnetic); 可能zero array ，因此您的accy始终zero